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(21 - 40 of 247)
Microscope, monocular with wood box and keys
Wing-section model for GALCIT 10 ft. wind tunnel
Keuffel and Esser Paragon engineers ruler
Proportional dividers
Proportional dividers
Polaroid Photo-Elastic Specimens No. 449
Telescope from George Ellery Hale
Two mineral samples
Grating, concave
Oxygen analyzer, Model E2
Planimeter no. 132
Field protractor
Optical secondary emission amplifier, C61
Slide rule
Logarithmic slide rule
Ion chamber, early (B)
Elliot beam compass
Dotting instrument
Microscope of Max Delbrueck