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قراءة كتاب Astronomical Instruments and Accessories
تنويه: تعرض هنا نبذة من اول ١٠ صفحات فقط من الكتاب الالكتروني، لقراءة الكتاب كاملا اضغط على الزر “اشتر الآن"
Astronomical Instruments and Accessories
L4020b CAMERA ATTACHMENT will fit in place of the observing telescope. It is fitted with long focus objective and standard plate holder 2½"×2½". The plate holder is provided with swivel for proper focusing of the spectrum. The slit is so arranged that four exposures can be made on one plate.
| Price | $20.00 |
Cat. No. L4020c SCALE TUBE. The third arm of the instrument can be easily attached and rotated and clamped in any position. It may also be used for holding a second Collimator.
| Price | $20.00 |
Cat. No. L4021 STUDENT'S SPECTROMETER. This instrument is in every respect similar to our L4020, but some of the higher finish has been omitted. All the essentials are carefully constructed and the optical parts are of the best quality. The circle is protected but only one vernier reading to 30 sec. is fitted to the instrument. The magnifying glass is omitted.
| Price, including prism | $60.00 |
TRANSCRIBERS' NOTES
General: Corrections to punctuation have not been individually noted.
General: Inconsistent spelling of catalog/catalogue preserved as in original.
Page 7: magnifiing corrected to magnifying and celestrial corrected to celestial.
Page 17: intensisy corrected to intensity.
Page 18: hundreths corrected to hundredths. LaPlatta as in original.
NB The final two pages of the book, on Astronomical, physical and physiological Apparatus, are in a slightly different format in the original. Particularly, prices are not in bold. That has been preserved in this version.