Search: Herschel, John in correspondent 
Wight, Jr., Alexander in correspondent 
Sorted by:

Showing 13 of 3 items

From:
Alexander Wight, Jr.
To:
Sir John Herschel
Date:
[28 March 1856]
Source of text:
RS:HS 18.245
Summary:

New method for constructing circular lenses up to 10-feet diameter for £50. Focusing power sufficient to melt metals. Wants to send 3-inch sample to JH.

Contributor:
John Herschel Project
From:
Alexander Wight, Jr.
To:
Sir John Herschel
Date:
[3 April 1856]
Source of text:
RS:HS 18.246
Summary:

Sends small lens. Its components neither parallel nor concentric; contains water. Suggests new polishing method. Estimates 4-foot lens would cost £7-£8. [JH Note: Tested and returned lens. Noted advantages and deficiencies and suggests improvements. Listed others who built similar lenses.]

Contributor:
John Herschel Project
From:
Alexander Wight, Jr.
To:
Sir John Herschel
Date:
[9 April 1856]
Source of text:
RS:HS 18.247
Summary:

Lens safely returned. Not aware of lenses in 1851 Exhibition or of C. F. Sturm's solid lenses. Notes advantages of plate glass. Offers to make three foot by three foot square lens. Recognizes limitations for use in astronomy; hopes for other applications.

Contributor:
John Herschel Project