The "Book Viewer" (Figure 3) is accessed via the "View Book" or thumbnail links on the Resource Record page. Only one book may be accessed at a time. The "Book Viewer" includes various features and controls for exploring the book.
Figure 3: "Book Viewer" Interface. The left-hand navigation panel includes the Book Information (A), Search Inside This Book (B), Additional Book Links and Download PDF (C). The right column includes the Book Viewer features buttons (D), the page thumbnails (E), and navigation and display options (F)
Left Navigation Panel
The panel may be collapsed or expanded by clicking the double arrow icons ( or ). When the column is collapsed, it appears as a thin, vertical bar on the left-side of the screen.
Each box within the navigation panel may be expanded by clicking the plus symbol () to display its contents. The minus symbol () collapses the box to display only the feature's title bar.
The "Book Information" (Figure 4) appears at the top of the left column and includes four metadata fields from the resource record; titles, authors, subjects, and publication information.
Figure 4: Book Information.
Search queries are retrieved from the book's uncorrected full-text generated by Optical Character Recognition (OCR) software. The search engine retrieves results related to queries for a single word or quoted phrases. See Searching for how to search all of the resources in the Digital Collections and Searching Video Transcripts for how to search individual videos.
For example, entering the term "operation" will return "operation" as well as "operations", "operates", and "operative" (Figure 5). Entering a quoted phrase for "Asiatic Cholera" will return results while the same phrase without quotes will only retrieve a result if there is an exact match. Queries without any results will include the statement "No matches found."
Retrieved results include the page number and a snippet with the search term highlighted in bold. Each result's snippet includes only the first instance of the term found on the page (Figure 5). Results are listed in order of relevance. When you click on the individual page result, the full page will open in the right access panel.
Figure 5: Search Inside This Book with results for the query operation.
There are two links for accessing the resource record page or the bibliographic record in this box (Figure 6). The "Return to Resource Record" links returns to the book's Resource Record page. The "LocatorPlus Record" link opens a new browser window with the resource's bibliographic record in LocatorPlus, NLM's online catalog.
Figure 6: Additional Book Links to the Resource Record page and LocatorPlus.
You may download a complete copy of the book's PDF by selecting the title link in the "Download PDF" box (Figure 7). If a PDF is available, Adobe® Reader should open the PDF in a separate browser window. You can use the features in Adobe® Reader to print, save, or view the book. You must install Adobe® Reader on your computer to access the PDF document.
Figure 7: Download PDF with link to PDF file.
Opening PDF files in Firefox
If you use Firefox as your browser and you cannot view the book in the Adobe® Reader, you must update the browser options as follows:
- Select "Tools" from the Firefox menu bar
- Click "Options..." to view the "Options" pop-up window
- Select the "Applications" icon
- Scroll down to "Adobe Acrobat Document" in the "Content Type" column
- Select the dropdown arrow on the right in the "Action" column
- Change the option to "Use Adobe® Reader 9 (default)" or the version of the Adobe® Reader installed on your computer
- Click "OK"
- Restart Firefox
Right Access Panel
The right access panel includes the "Book Viewer's" feature buttons at the top, thumbnail images of the book's pages in the middle, and navigation controls at the bottom to navigate the thumbnail screens or individual pages (Figure 8).
Figure 8: Thumbnails View in the "Book Viewer." The Thumbnails button is selected (A), the thumbnails appear in sequential page order (B), and the navigation controls at the bottom automatically display 100 items per page (C).
The "Pages" button displays the full-size image of an individual page. The "Pages" view may also be accessed by clicking a thumbnail image of a page to view it in full-size. Once "Pages" is selected, all of the control buttons at the top of the access panel are activated.
The "Thumbnails" button displays the thumbnail images in a grid. The control buttons for zooming and flash are deactivated while in the "Thumbnails" view. Each thumbnail includes the sequential page number. The default display setting is 100 thumbnails per page.
The "Raw Text" button displays the text of the page you are viewing. The uncorrected text is generated by the Optical Character Recognition (OCR) software. It is used by the "Book Viewer's" search engine to generate results from your search queries (See Search Inside This Book).
The "Zoom In" and "Zoom Out" buttons allow you to minimize and maximize the size of the page image using the pre-defined zoom levels. The "Reset Zoom" button returns the page image to the original image size.
The "Use Flash" button enables the Flash-based zooming tool. The tool allows you to explore the page by zooming and panning. When the tool is enabled, your cursor will change to a magnifying glass (Figure 9A) and a small thumbnail image of the page (Figure 9B) appears in the upper right corner of the screen.
To access the features in the "Use Flash" control panel, hover over the thumbnail (Figure 10). Click the "Use Flash" button again to deactivate the setting and return to the "Pages" view.
Figure 9: The Default View of the Use Flash Tool. The cursor changes to a magnifying glass (A) and a thumbnail image of the page appears in the upper right corner of the screen (B).
The "Use Flash" control panel includes various features for manipulating the page image (Figure 10). The magnifying glass allows you to zoom into a specific location on the page and the hand tool allows you to readjust the position on the page (Figure 10A). Rotate the image using the red arrow in the dial or clicking the left or right rotation symbols to rotate by increments of ninety degrees (Figure 10B).
The plus and minus controls and the slider (Figure 10C) zoom in and out of the page image. The cursor appears as an arrow while in the "Use Flash" control panel (Figure 10D). The location and size of the red box changes as you zoom, rotate or resize the page image (Figure 10E).
Figure 10: The Use Flash Tool includes a magnifying glass and hand tool (A) and the dial and gray boxes for rotation (B) across the top. The plus and minus buttons and the slider bar (C) are located on the right side. The cursor appears as an arrow while hovering in the tool (D). The red box identifies which part of the page is being viewed (E).
The navigation controls are located at the bottom of the right access panel. The controls allow you to navigate through the thumbnail images or individual pages using the first, previous, next, and last buttons ().
Enter a different page number in the "Page" field to view a new screen of thumbnail images or a different page. The drop down menu allows you to change the number of thumbnails displayed from 100 to 200, 500, or 1,000 (Figure 11). However, it is not active when you are viewing individual pages or if there are less than 100 pages in the book (Figure 12).
Figure 11: Navigation controls settings in Thumbnails View.
Figure 12: Navigation controls settings in Pages view. The Items per page is deactivated.